Wired vs Wireless Each has advantages and disadvantages. Wireless looks neater, but you have a .very tiny radio transmitter, which can very easily suffer from the bane of all radio devices RFI. The transmitter (wheel unit) will use the most power, so you want a unit that uses a common battery for that unit. The head part all use a coin cell, but it should last a year or two.

Some units might allow you to set what displays where, others don't. Typically though if it has cadence, that will be the large line, if it does not, speed is the large number.

Cadence is a training tool, in other words, a recreational rider who is not performance driven does not need it. However If your buying your first computer, get one with it, to see how your doing,providing the price premium isn't insane....

Actually with a clock count for six seconds, makes the math way easier, if I count 9 in six seconds, that gives a cadence of 90, if I count 14 in 10 seconds, 14 times 6 = 84, but I gotta think about it.